Before I get poisoned, I desmantled the lock cases. Lock B was so rusty I had to hit it with a hammer before it would move and I could grease it. (The key that I had made works now! I am not that clumsy after all).
Here are the pictures of the interior of lock B with its wards, and of the key turning in it. The key and the wards fit perfectly. How on earth could they make such wonderful keys in the 1850’s ?